Beyond Steel: An Archive of Lehigh Valley Industry .Traduire cette page
Production of Portland cement in the United States began in 1871 at Coplay, about a mile south-east from Siegfried, along the Lehigh River, though on the other side of the river in Lehigh County. David O. Saylor and associates began producing natural cement there in 1866, as the Coplay Cement Company. He also began experiments to produce Portland cement and successfully did so, in 1871 being ...
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